Re: Well known scan-attack

  • From: "Chad Roush" <croush@xxxxxxxxxxx>
  • To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
  • Date: Wed, 29 Oct 2003 10:27:41 -0600

I too am getting this messages.  It's nice to know it is nothing to
worry about.

Another one I am getting is port scans being reported from IP's
belonging to my ISP's DNS servers.
Any suggestions on what to do to clean these up? It would be nice to
reduce the number of irrelevant
notifications I am getting.

Thanks,

Chad

-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx] 
Sent: Wednesday, October 29, 2003 8:20 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Well known scan-attack

http://www.ISAserver.org

This is a common script kiddie tool.
It's designed to send your machine into a death-spiral of
self-referencing responses, since the source and destination IPs will
always alternate between the local machine (127.0.0.1 and your external
IP).

ISA blocks it as spoofed, since it was received on a network interface.
127.0.0.1 is invalid except in the memory-mapped network inside the
machine.

  Jim Harrison
  MCP(NT4, W2K), A+, Network+, PCG
  http://isaserver.org/Jim_Harrison/
  http://isatools.org
  Read the help / books / articles!


On Wed, 29 Oct 2003 13:52:27 +0300
 "Andrey Silkin" <silkin@xxxxxx> wrote:
http://www.ISAserver.org

Hi all ! I Some days ago I have received strange notification : ISA
Server detected a well-known port scan attack from Internet Protocol
(IP) address 127.0.0.1. A well-known port is any port in the range of
1-2048. I don't understand how can it be ? 127.0.0.1 - is the local
private address ! It is impossible that somebody scaned my my server
from himself . Did somebody have the same notification ?
 
 
Best Regards
Andrey Silkin


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